As per the reviews on many technology related websites what we can see is the below
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iPad Pro 12.9 (2021)
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iPad 10.2 (2020)
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iPad Air 4 (2020)
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iPad Mini 5 (2019)
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iPad Air 3 (2019)
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iPad Pro 11 (2018)
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iPad Pro 12.9 (2018)
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iPad 10.2 (2019)
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iPad 9.7 (2018)
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iPad 9.7 (2017)
As listed in the websites that iPad Pro 12 (2021) being the best am sharing you the specs and review of the same. It is the biggest upgrade to the iPad Pro since its inception.
SPECIFICATIONS
Weight: 682gDimensions: 280.6 x 214.9 x 6.4mmOS: iPadOS 14Screen size: 12.9-inchResolution: 2048 x 2732 pixelsCPU: Apple M1Storage: 128GB/256GB/512GB/1TB/2TBmicroSD slot: NoBattery: Up to 10 hoursRear camera: 12MP + 10MPFront camera: 12MP
The iPad Pro 12.9 (2021) is a very big, very powerful, and very expensive tablet. That’s true of all the 12.9-inch iPad Pro models, but on the power front this one takes things to a whole new level, swapping out a mobile chipset for the Apple M1, which is found in top-end MacBooks and iMacs.
This means it’s a tremendously high-powered device, ideal for demanding tasks like video editing, graphic design, and top-tier games.
On top of that, the iPad Pro 12.9 (2021) also has a superb 2048 x 2732 Mini LED screen. This is the first iPad to use that display technology, and it allows for a seriously bright screen with great contrast.
Elsewhere you get 10 hours of battery life, a typically premium aluminum shell, up to 2TB of storage, and support for the Magic Keyboard and Apple Pencil 2, allowing you to take this beyond a mere productivity device.